Thiadiazolylazo compounds and textile materials dyed therewith

ABSTRACT

AZO COMPOUNDS HAVING THE FORMULA   1-((5-(R-X-)-1,3,4-THIADIAZOL-2-YL)-N=N-),2-(A-NH-),   4-(R2-N(-R3)-),5-R1-BENZENE   WHEREIN R IS ALKYL, ALKYL, CYCLOALKYL OR ARYL; X IS -OOR -S-; A IS ACYL; R1 AND R2 EACH IS HYDROGEN OR ALKYL; AND R3 IS ALKYL, ARE USEFUL AS DYES FOR POLYAMIDE TEXTILE MATERIALS ON WHICH THE COMPOUNDS EXHIBIT IMPROVED BRIGHTNESS, FASTNESS AND MIGRATION PROPERTIES.

3,657,215 THIADIAZOLYLAZO COMPOUNDS AND TEXTILE MATERIALS DYED THEREWITH Max A. Weaver and David J. Wallace, Kingsport, Tenn., assiguors to Eastman Kodak Company, Rochester, N .Y. No Drawing. Filed June 16, 1969, Ser. No. 833,746 Int. Cl. (30% 29/06; D061) 3/24 U.S. Cl. 260-158 ABSTRACT OF THE DISCLOSURE Azo compounds having the formula wherein R is alkyl, allyl, cycloalkyl or aryl; X is -O or S-; A is acyl; R and R each is hydrogen or alkyl; and R is alkyl, are useful as dyes for polyamide textile materialsv .on which the compounds exhibit improved brightness, fastness and migration properties.

This invention relates to certain novel azo compounds and, more particularly, to 1,3,4-thiadiazolylazoaniline compounds, in which the ring of the aniline coupling component is substituted with an acylamido group, and to polyamide textile materials dyed therewith.

The novel compounds of the invention have the formula' 1 NHA wherein R is an alkyl, allyl, cycloalkyl or aryl radical;

X is a sulfur or oxygen atom;

A is an acyl radical; v

R is hydrogen or alkyl;

R is hydrogen or alkyl; and

R is alkyl, furylalkyl, thienylalkyl, or pyrrolylalkyl.

The novel azo compounds exhibit excellent dyeability properties, including affinity and build-up, when applied to polyamide fibers, yarns and fabrics according to conventional dyeing procedures. The azo compounds also exhibit excellent brightness, fastuess, and migration properties on polyamide fibers. For example, the compounds of the invention possess superior fastness to light when compared to the compounds disclosed in French Pat. 1,503,- 249.

The alkyl radical which R can represent can be straightor branch-chain, substituted or unsubstituted alkyl having from 1. to about carbon atoms. Methyl, ethyl, propyl, isopropyl, butyl, isobutyl, amyl and hexyl are typical unsubstituted alkyl groups represented by R. Typical groups which can be present on alkyl radical R are hydroxy, e.g. Z-hydroxyethyl, 3-hydroxypropyl; halogen, e.g. 2-chloroethyl, 3-bromopropyl; lower alkoxycarbonyl, e.g. 2- ethoxycarbonylethyl, 3-methoxycarbonylpropyl; lower alkanoyloxy, e.g. 2-acetoxyethyl; lower alkoxy, e.g. Z-methoxyethyl; lower alkanoyl, e.g. Z-acetylethyl; aroyl, e.g. benzoylmethyl; cyano, e.g. 2-cyanoethyl; carbamoyl, e.g. Z-carbamoylethyl; dicarboximido, e.g. 3-succinimidopro- Patented Apr. 18, 1972 ice pyl; etc. As used herein to'describe an alkyl moiety-con- 8 Claims taining about 4 carbon atoms. The alkyl radical represented by R can also be substituted cycloalkyl, e.g. cyclopentyl, cyclohexyl, cycloheptyl, and lower alkyl-substituted derivatives thereof, and with aryl, e.g. phenyl and phenyl substituted with lower alkyl, lower alkoxy, or halogen. Cyclohexylmethyl, 2-cyclopentylethyl, 4-ethylcyclohexylmethyl, 4 methoxycyclohexylmethyl, 2 (3 chlorohexyl)ethyl, benzyl, p-methylbenzyl, 2-p-ethoxyphenylethyl, 4-chlorobenzyl, 2-phenylethyl, etc. are illustrative of the cycloalkylalkyl and arylalkyl groups which R can represent. The unsubstituted alkyl radicals which R can represent preferably are lower alkyl, e.g. methyl, ethyl, propyl, and butyl, while the preferred substituted alkyl radicals contain from about 2 to about 8 carbon atoms, e.g. 2-hydroxyethyl, benzyl, etc.

The aryl groups which R can represent preferably are monocyclic, carbocyclic aryl such as unsubstituted phenyl and phenyl substituted, for example, with lower alkyl, lower alkoxy, halogen, etc. The cycloalkyl groups represented by R include cyclopentyl, cyclohexyl, cycloheptyl and lower alkyl-substituted derivatives thereof. Specific examples of the cycloalkyl and aryl groups which R can represent appear in the preceding paragraph.

The acyl radicals represented by A can be formyl, lower alkanoyl, aroyl, cyclohexylcarbonyl, lower alkoxycarbonyl, aryloxycarbonyl, lower alkylsulfonyl, cyclohexylsulfonyl, arylsulfonyl, carbamoyl, lower alkylcarbamoyl, arylcarbamoyl, sulfamoyl, lower alkylsulfamoyl, furoyl, etc. The alkanoyl groups can be substituted with substituents such as halogen, aryl, cyano, lower alkoxy, benzyloxy, lower alkylthio, lower alkylsulfonyl, etc. The alkylsulfonyl groups also can be substituted, for example with cyano, hydroxy, halogen and the like. The alkoxycarbonyl groups can he substituted, for example, with hydroxy, alkoxy and cyano. Acetyl, propionyl, butyryl, cyanoacetyl, chloroacetyl, trifluoroacetyl, phenylacetyl, methoxyacetyl, methylthioacetyl, methylsulfonylacetyl, methoxycarbonyl, propoxycarbonyl butoxycarbonyl, methylsulfonyl, ethylsulfonyl, propylsulfonyl, butylsulfonyl, 2-cyanothylsulfonyl, Z-hydroxyethylsulfonyl, and 2-chloroethylsulfonyl, are example of the alkanoyl, alkoxycarbonyl and alkylsulfonyl groups which A can represent. The aryl group, designated Ar, of the arylalkanoyl, aroyl, i.e. arylcarbonyl, aryloxycarbonyl, arylsulfonyl, and arylcarbamoyl groups preferably is monocyclic, carbocyclic aryl such as unsubstituted phenyl and phenyl substituted with, for example, lower alkyl, lower alkoxy, halogen, etc. Tolyl, anisyl, p-bromophenyl and opdichlorophenyl are typical of such aryl groups. Dimethylcarbamoyl, ethylcarbamoyl, propylcarbamoyl, butylcarbamoyl, phenylcarbamoyl and dimethylcarbamoyl are examples of the substituted carbarnoyl groups.

Examples of the alkyl groups represented by R appear in the description relating to R. The alkyl groups represented by R and R can contain from 1 to about 6 carbon atoms such as, for example, methyl, ethyl, isopropyl, propyl butyl, isobutyl, l-methylbutyl, amyl, 1,2-dimethylpropyl, 1,3-dimethylbutyl, hexyl, etc. Preferably, one of R and R is alkyl and the other is hydrogen. Furfuryl, 2-thienylmethyl and 2-pyrrolylmethyl are examples of the furylalkyl, thienylalkyl, and pyrrolylalkyl groups which R can represent.

The novel azo compounds which, because of their economy and, especially, their excellent properties, are particularly valuable polyamide dyes are those of Formula I in which 'R is lower alkyl, especially methyl or ethyl; X is O- or -S; A is lower alkanoyl, lower alkoxycarbonyl, lower alkylsulfonamido, benzamido or lower alkylcarbamoyl; R is hydrogen or methyl; R is hydrogen or lower alkyl; one of R and R is hydrogen; and R is lower alkyl or furfuryl.

The novel azo compounds are prepared according to known procedures by diazotizing an amine having the formula 1,3,4 thiadiazol 2 ylazo)--acetamido-N-sec-butyl-2- methylaniline, melts at 150-152 C. It produces bright pink shades on polyamide fibers and has excellent lightfastness and migration properties.

5 EXAMPLE 3 and coupling the resulting diazonium salt with a coupler Z-amino-S-ethylthio-1,3,4-thiadiazole (1.61 g.) is diazohaving the formula tized and coupled with 5-acetamrdo-N-rsobutyl-Z-methyh aniline (2.20 g.) according to the procedure described in Example 2. The product, 4-(S-ethylthio-1,3,4-thiadiazol- 2-ylazo)-5-acetamido-N-isobutyl 2 methylaniline melts at 190-192 C. and produces bright pink shades on polyamide fibers. NHA EXAMPLE 4 wherein R, X, A, R R and R are define above The 2-amino 5 methylthio-1,3,4-thiadiazole (1.47 g.) is diazotizable aminothiadiazoles are synthesized by techdiazotized and coupled with 3 acetamido N,N-diethylniques described in the literature Ber. 28, 946; British aniline as described i Example 2 to i l 4-( 5. P Chem- 500-, 1967, methylthio-1,3,4-thiadiazol 2 ylazo).-3-acetamido-N,N- p 2 amino 5 mercapto-1.3.4-thiadiaZ01e can be diethylaniline (M.P. 176-178 c. which imparts a pink treated With alkylating 0f aIylatiIlg agents, Such as alkyl 20 shade of excellent fastness to light to polyamide fibers. halides, alkyl sulfates, alkyl phosphates, aryl halides, etc., EXAMPLE 5 at elevated temperatures in the presence of a solvent and a base such as potassium carbonate or sodium acetate. According to the procedure described in Example 2, 2- The couplers can be synthesized by avariety of methods. amino-S-methylthio 1,3,4 thiadiazole (1.47 g.) is di- For example, an acylamidoaniline or a nitroacylanilide azotized and coupled with 5-acetamido-N-(1,3-dimethylcan be condensed with an aldehyde at elevated pressures butyl) 2 methylaniline (2.48 g.). The product, 4-(5- and temperatures in the presence of a hydrogenation catamethylthio-1,3,4-thiadiazol 2 ylazo)-5-acetamido-N- lyst such as platinum to obtain the N-alkyl-m-acylamido- (1,3-dimethylbutyl) 2 methylani'line, melts at 198-200 aniline which, if desired, can be treated with an alkylating C. after recrystallization from methanol and produces agent to yield the N,N-dialkyl-m-acylamidoaniline coupler. bright pink shades on polyamide fibers.

The preparation of the couplers and the novel azo compounds of the invention is further illustrated by the fol- EXAMPLE 6 lowing examples 2-am1no 5 ethoxy-1,3,4-thiadiazole (1.45 g.) is di- EXAMPLE 1 azotized and coupled with 5 acetamido-N-seobutyl-Z- methylaniline (2.20 g.) as described in Example 2 to yield A mixture of 3'-amino-pacetoluidide -0 g-), 4-(5-ethoxy-1,3,4-thiadiazol 2 ylazo)-5-acetamido-N- butanone (48.0 g.), ethanol (200 ml.), 5 g. Pt 0n C Catasec-butyl-2-methylaniline. It produces bright scarlet shades y and 1 of acetic acid is hydrogenated in an autoon nylon and exhibits excellent fastness to light. clave at 165 C. and 1000 p.s.i. until the hydrogen uptake ceased. The mixture from the autoclave is filtered to EXAMPLE 7 remove the catalyst and then most of the ethanol is evaporated. The product, 5 acetamido-N-sec-butyl-Z-methyl- ZFmmo's'ethylthlo'l34fthladlazole 13 aniline crystallizes and is collected by filtration and dried azotlzed End couple? wllh Snacetamldo-N-furfuryl 2- t me t 91 93 C methylamline as described 1n Example 2. The azo compound obtained produces pink shades having excellent EXAMPLE 2 brightness and fastness properties on polyamide fibers. Sodium nitrite (0.72 g.) is added portionwise to 5.0 ml. The azo compound has the structure" of conc. H with stirring. The solution is cooled and CH 10 ml. of 1:5 acid (1 part propionic:5 parts acetic acid) N N I is added below 15 C. After cooling, 2-amino-5-(ethyl- 50 c tty-Si fl-NN Micki -U thio)l,3,4thiadiazole (1.61 g.) is added, followed by 10 ml. 1:5 acid, all below 5 C. The diazotization reaction is NHCOCHS stirred and kept at 0-5 C. for 2 hr. and is then added to a cooled solution of S-acetamido-(N-sec-butyl)-2-methyl- H The compounds, which conform to Formula I, set aniline (2.20 g.) dissolved in 40 ml. 1:5 acid. The mixture forth in the examples of the table are prepared according is buffered by the addition of ammonium acetate until a to the procedures described in the preceding examples. test sample is neutral to Congo Red paper. After 2 hr. at The compounds of the table in which X is a sulfur atom below 10 C., the coupling is drowned with water and produce bright pink shades and those in which X is an the product collected by filtration, washed with water, and oxygen atom produce bright scarlet shades on polyamide dried in air. The azo compound obtained, 4-(5-ethy1thio- 6O fibers.

TABLE Example No. R X A R1 R3 R2 s -COCH -OH3 CII(CH3)2 H s COCH CH3 CI-I(C2Hs)z H s -COCH3 CH3 CHzCHzCHs H s COCzH5 CHJ -(CH2)sCH H O -COC2H5 CH3 (CH2)3CH3 II 0 COC2H -CHJ -CH(CH3)CH2CII3 H o COCH3 CHs CH(CH3)CHzCHa H 0 COCHzCl CH3 CH(CH3)CH1CH; H s CO0H2Cl -CH; -CH(CHs)CH2CH,-; H s CONHC2H CH; CH(CH3)CHzCH H s SO@CH3 CH (,II(CHa)CIIzCII 11 s -COC6H5 CHa CH(C1I3)CH2CH3 1r a s COCGII1I CH3 -CH(CH.1)CHZCII H 41mm H 25:: -I. C2H35 2 s 0 m J :CH: i i fl E The novel azo compounds can be applied to polyamide textile materials according to known disperse dyeing techniques. Various dispersing and wetting agents can be employed in the dispersion of the finely divided dye compound in an essentially aqueous dyebath. Procedures by which the compounds of the invention can be applied to polyamide textile materials are described in U.S. Pats. 3,100,134 and 3,320,021. The following example illustrates a method for applying the novel compounds to polyamide fibers.

EXAMPLE 64 The azo compound (50.0 mg.) of Example 3 is dis persed in cc. of 2-methoxyethanol. A small amount (3-5 cc.) of a 3% sodium lignin sulfonate solution is added, with stirring, and then the volume of the bath is brought to 150 cc. with water. A 5 g. textile fabric made of nylon 66 fibers is placed in the bath which is then slowly brought to the boil. The dyeing is carried out at the boil for 1 hr. with occasional stirring. The dyed fabric is then removed from the dyebath, rinsed wth water, and dried in an oven at 250 The fabric is dyed a bright shade of pink exhibiting excellent fastness properties when tested in accordance with the procedures described in the Technical Manual of the American Association of Textile Chemists and Colorists, 1968 edition.

The polyamide materials which can be dyed with the novel azo compounds are well-known and include nylon 66 (polyhexamethylene adipamide) manufactured by the polymerization of adipic acid and hexamethylenediamine, nylon 6 (polycaprolactam) prepared from epsilon-aminocaproic acid lactam (caprolactam), and nylon 8. A detailed description of the synthetic polyamide materials which are dyed bright fast shades by the compounds of the invention is set forth in U.S. Pat. 3,100,134. Although the compounds of the invention are especially suitable for dyeing polyamide textile materials, they also produce bright shades of pink or scarlet on other hydrophobic textile materials such as cellulose acetate and polyester fibers.

The invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.

We claim:

1. A compound having the formula R is lower alkyl;

A is lower alkanoyl; lower alkanoyl substituted with chlorine, bromine, aryl, cyano, lower alkoxy, benzyloxy,

lower, alkylthio, or lower alkylsulfonyl; lower alkyl- 7. A compound according to claim 1 having the formula sulfonyl; lower alkoxycarbonyl; cyclohexylcarbonyl CH 2 7 1 2 1 1 3 aroyl; carbamoyl; or lower alkylcarbamoyl; each aryl CH group being phenyl or phenyl substituted With lower r J1 alkyl, lower alkoxy, chlorine or bromine; 5 CZILO 5 N N NE CHCHZCHS R and R each is hydrogen or lower alkyl, one of R and R being hydrogen; and 111100011 R3 F Y furylalkyl, thienylalkf/l or Pyrrolylalkyl 8. A compound according to claim 1 having the formula taming from 1 to about 6 carbon atoms. 2. A compound according to claim 1 wherein A is W- 10 CH3 er alkanoyl, lower alkoxycarbonyl or benzoyl; R is l I l I hydrogen or methyl; R is hydrogen or lower alkyl; and J- 111052 R is lower alkyl or furfuryl. 3. A compound according to claim 1 having the formula 1r, NHCOCHa d N N CH References Cited E C H 4 1| 1m 1 HCH CH UNITED STATES PATENTS 2 5 S 2 3 2,955,901 10/1960 Kruckenberg 260-158 X 20 3,007,915 11/1961 Merian 260158 Home 3,096,320 7/1963 Lange et a1. 260-158 4. A compound according to claim 1 having the formula 3,101,988 8/1963 BOSSard 611 a1 260153 X CH 3,221,006 11/1965 Moore et a1. 260158 3 3,280,101 10/1966 Straley et a1. 260158 [I 3,336,286 8/1967 Sartori 260-158 CERES s NHCHECHWHM 3,428,621 2/1969 Wallace et al. 260-158 3,493,556 2/1970 Weaver et al. 260158 NHCOCHQ v 5. A compound according to claim 1 having the formula FOREIGN PATENTS 1,503,249 10/1967 France 260 158 H cit s-L l 11=11 115:; FLOYD DALE HIGEL, Primary Examiner NHCOCHS US. Cl. X.R. 6. A compound according to claim 1 having the formula 260-3063 562 R CH3 NN f caas' li- N=N NHOHCH CHCH 40 NHCOCH 

